Mutations that are harmful to cells occur more frequently than those that benefit cells
Indicate whether the statement is true or false
TRUE
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Viruses are sometimes classified by the organisms they infect. In fact, the first virus discovered only infects a particular plant. What was this first known virus?
a. leaf curl virus b. potato gall virus c. tobacco mosaic virus d. Dutch elm disease
In an experiment, the control group:a
disproves the theory. b. proves the hypothesis. c. proves the prediction. d. does not contain the variable being tested. e. is similar to the test group in all aspects including the variable being tested.
In which one of the following ways do prokaryotic cells differ from eukaryotic cells?
A) Prokaryotic cells have a plasma membrane composed entirely of protein. B) Prokaryotic cells lack a membrane-bound nucleus and other membranous organelles. C) Prokaryotic cells lack DNA, RNA, and ribosomes. D) Prokaryotic cells have cytoplasm that is bounded by a cell membrane. E) Prokaryotic cells have cytoplasm but lack a cell membrane.
Some viruses leave a cell by pushing through the cell membrane (rather than lysing the cell). When this happens, a portion of the membrane wraps around the viral capsid, becoming the envelope. What is the name for this process?
a. Budding b. Biosynthesis c. Conjugation d. Lysogeny